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DE102004005402B4 - Valve arrangement for lifting and lowering a lifting cylinder - Google Patents

Valve arrangement for lifting and lowering a lifting cylinder Download PDF

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Publication number
DE102004005402B4
DE102004005402B4 DE200410005402 DE102004005402A DE102004005402B4 DE 102004005402 B4 DE102004005402 B4 DE 102004005402B4 DE 200410005402 DE200410005402 DE 200410005402 DE 102004005402 A DE102004005402 A DE 102004005402A DE 102004005402 B4 DE102004005402 B4 DE 102004005402B4
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Germany
Prior art keywords
valve
lifting
lifting cylinder
throttle
way valve
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Expired - Fee Related
Application number
DE200410005402
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German (de)
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DE102004005402A1 (en
Inventor
Thomas Dipl.-Ing. Stolten
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Jungheinrich AG
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Jungheinrich AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/0413—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed in one direction only, with no control in the reverse direction, e.g. check valve in parallel with a throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
    • F15B2211/40561—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged upstream of the flow control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Ventilanordnung für das Heben und Senken eines Hubzylinders, insbesondere in einem Flurförderzeug, bei der eine Pumpe über ein Wechselventil in seiner ersten Stellung und ein 2/2-Wegeventil mit dem Hubzylinder und der Hubzylinder über das 2/2-Wegeventil und das Wechselventil in seiner zweiten Stellung mit einem Tank verbunden ist, wenn ein einziges Vorsteuermittel das 2/2-Wegeventil aus der Neutralstellung, in der es den Hubzylinder in der eingenommen Position halt, in eine Schaltstellung verstellt, und der Durchgang des 2/2-Wegeventils in seiner Schaltstellung eine von dem Vorsteuermittel verstellbare Drossel enthält und das Vorsteuermittel die Drossel in Abhängigkeit von einem Vorsteuersignal verstellt, dadurch gekennzeichnet, daß der Drossel (36) ein Zweig parallel geschaltet ist, der einen beim Heben des Hubzylinders öffnendes Rückschlagventil (38) enthält.valve assembly for the Lifting and lowering of a lifting cylinder, in particular in an industrial truck, when a pump over a shuttle valve in its first position and a 2/2-way valve with the lifting cylinder and the lifting cylinder via the 2/2-way valve and the Shuttle valve in its second position connected to a tank is when a single pilot means the 2/2-way valve from the Neutral position, in which it takes the lifting cylinder in the position halt, in a switching position adjusted, and the passage of the 2/2-way valve in its switching position one of the pilot control means adjustable Throttle contains and the pilot control means the throttle in response to a pilot signal adjusted, characterized in that the throttle (36) is a branch is connected in parallel, which opens a lifting the lifting cylinder check valve (38).

Figure 00000001
Figure 00000001

Description

Die Erfindung bezieht sich auf eine Ventilanordnung für das Heben und Senken eines Hubzylinders, insbesondere in einem Flurförderzeug, nach dem Oberbegriff des Patentanspruchs 1.The The invention relates to a valve assembly for lifting and lowering a lifting cylinder, in particular in an industrial truck, according to the preamble of claim 1.

Es ist allgemein bekannt, in den Weg zwischen einer Hydraulikpumpe und einem Hubzylinder ein 3/3-Wegeventil oder gemäß DE 202 08 577 U1 zwei separat voneinander getrennte Ventile zur Bildung eines Dreiwegestromreglers anzuordnen. Die Ventile sind mit entsprechenden Vorsteuermitteln ausgestattet, z. B. Elektromagneten, welche die Ventile zum Ansteuern eines gewünschten Betriebszustands verstellen. Hierunter ist das Heben und Senken sowie die Lasthaltung zu verstehen. Bei der Lasthaltung soll der Hubzylinder in der eingenommenen Position gehalten werden. Die Lasthaltung wird üblicherweise durch ein Rückschlagventil realisiert. Bei einem 3/3-Wegeventil erfolgt die Lasthaltung in der Neutralstellung des Ventils, während der Hebevorgang eine Betätigung in einer Richtung und der Senkvorgang eine Betätigung in der entgegengesetzten Richtung erfordert. Der Senkzweig des bekannten 3/3-Wegeventils wird häufig als verstellbare Drossel ausgebildet, um die Senkgeschwindigkeit einzustellen bzw. zu begrenzen. Nach DE 202 08 577 U1 wird die Drossel in Abhängigkeit von einem Vorsteuersignal des Wegeventils verstellt.It is well known in the way between a hydraulic pump and a lifting cylinder a 3/3-way valve or according to DE 202 08 577 U1 to arrange two separately separated valves to form a three way flow regulator. The valves are equipped with appropriate pilot control means, eg. B. electromagnets which adjust the valves for driving a desired operating condition. By this is meant the lifting and lowering as well as the load attitude. In the load holding the lifting cylinder should be kept in the assumed position. The load holding is usually realized by a check valve. In a 3/3-way valve, the load is held in the neutral position of the valve, while the lifting operation requires one-way operation and the lowering operation requires an operation in the opposite direction. The Senkzweig the known 3/3-way valve is often designed as an adjustable throttle to adjust or limit the lowering speed. To DE 202 08 577 U1 the throttle is adjusted in response to a pilot signal of the directional control valve.

Aus DE 31 48 852 A1 ist eine elektrohydraulische Steuerschaltung für eine Ladebordwand bekannt geworden, bei der eine Ventilanordnung für das Heben und Senken eines Hubzylinders offenbart ist und bei der eine Pumpe über ein Wechselventil in seiner ersten Stellung und ein 2/2-Wegeventil mit dem Hubzylinder und der Hubzylinder über das 2/2-Wegeventil und das Wechselventil in seiner zweiten Stellung mit einem Tank verbunden ist, wenn ein einziges Vorsteuermittel das 2/2-Wegeventil aus der Neutralstellung in eine Schaltstellung verstellt. Der Durchgang des 2/2-Wegeventils in seiner Schaltstellung enthält eine von dem Vorsteuermittel verstellbare Drossel, wobei das Vorsteuermittel die Drossel in Abhängigkeit von einem Vorsteuersignal verstellt.Out DE 31 48 852 A1 an electro-hydraulic control circuit for a tail lift has become known in which a valve assembly for lifting and lowering a lifting cylinder is disclosed and in which a pump via a shuttle valve in its first position and a 2/2-way valve with the lifting cylinder and the lifting cylinder on the 2/2-way valve and the shuttle valve is connected in its second position with a tank when a single pilot control adjusts the 2/2-way valve from the neutral position to a switching position. The passage of the 2/2-way valve in its switching position contains an adjustable throttle by the pilot control means, wherein the pilot control means adjusts the throttle in response to a pilot signal.

Der Erfindung liegt die Aufgabe zugrunde, eine Ventilanordnung für das Heben und Senken eines Hubzylinders, insbesondere in einem Flurförderzeug der eingangsgenannten Art dahingehend zu verbessern, daß ein ausreichender Volumenstrom für das Heben bereitgestellt wird.Of the Invention is based on the object, a valve assembly for lifting and lowering a lifting cylinder, especially in a truck of the type mentioned above to improve that a sufficient Flow rate for the Lifting is provided.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.These The object is solved by the features of claim 1.

Häufig wird für das Heben ein größerer Volumenstrom benötigt, während die Senkgeschwindigkeit aufgrund einer Normfestlegung begrenzt ist. Daher sieht die Erfindung vor, daß parallel zur Drossel ein Zweig geschaltet ist, der ein beim Heben des Hubzylinders öffnendes Rückschlagventil enthält. Beim Heben wird daher ein Zusatzkanal geöffnet, der beim Senken durch das Rückschlagventil aufgrund des zurückströmenden Mediums geschlossen wird. Während des Senkens kann der Volumenstrom über eine proportional arbeitende Drossel begrenzt werden.Frequently becomes for the Lift a larger volume flow needed while the lowering speed is limited due to a standard definition. Therefore, the invention provides that parallel to the throttle Branch is connected, which opens when lifting the lifting cylinder check valve contains. At the Lifting is therefore an additional channel opened, the sinking through the check valve due to the backflowing medium is closed. While of lowering, the volume flow can be proportional to a working Throttle be limited.

Ist eine Verstellung des Öffnungsquerschnitts im Ventildurchgang gewünscht, ist nach einer Ausgestaltung der Erfindung im Durchgang des 2/2-Wegeventils in seiner Schaltstellung eine vom Vorsteuermittel verstellbare Drossel vorgesehen, die in Abhängigkeit von einem das Vorsteuermittel steuernden Steuersignal verstellt wird.is an adjustment of the opening cross-section desired in the valve passage, is in one embodiment of the invention in the passage of the 2/2-way valve in its switching position adjustable by the pilot control throttle provided, depending on adjusted by a control signal controlling the pilot control means becomes.

Das Wechselventil wird bei der Erfindung vorzugsweise durch geeignete Mittel gegen den mit der Pumpe verbundenen Anschluß vorgespannt und zwar nach einer weiteren Ausgestaltung der Erfindung entweder durch Schwerkraft und/oder mit Hilfe einer Feder.The Shuttle valve is in the invention preferably by suitable Medium biased against the connected to the pump port namely according to a further embodiment of the invention either by gravity and / or by means of a spring.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert.One embodiment The invention will be explained in more detail with reference to a drawing.

Die einzige Figur zeigt ein Schaltbild einer Ventilanordnung nach der Erfindung.The only figure shows a circuit diagram of a valve assembly according to the Invention.

In der einzigen Figur speist eine Hydraulikpumpe 10 in den ersten Anschluß P eines Wechselventils 12. Der zweite gegenüberliegende Anschluß T führt zum Tank 14 für die Pumpe 10. Ein seitlicher Anschluß H führt zu einem 2/2-Wegeventil 16, das mit den Ausgängen 2 und wahlweise mit einer Leitung 18 verbunden ist. Diese führt über ein Zweiwege-Stromregler 20 zu einem hydraulischen Hubzylinder 22. Parallel zum Zweiwege-Stromregler 20 liegt ein Zweig 24, mit einem Rückschlagventil 26. Der Zweiwege-Stromregler 20 mit den Steuerleitungen 40, 42 und der Vorspannfeder 46 ist eine Senkbremse, die eine lastunabhängige Senkgeschwindigkeit realisiert, wie an sich bekannt.In the only figure feeds a hydraulic pump 10 in the first port P of a shuttle valve 12 , The second opposite port T leads to the tank 14 for the pump 10 , A side port H leads to a 2/2-way valve 16 that with the outputs 2 and optionally with a line 18 connected is. This leads via a two-way current regulator 20 to a hydraulic lifting cylinder 22 , Parallel to the two-way current controller 20 lies a branch 24 , with a check valve 26 , The two-way current regulator 20 with the control lines 40 . 42 and the biasing spring 46 is a lowering brake that realizes a load-independent lowering speed, as known per se.

Der nicht gezeigte Schieber des 2/2-Wegeventils wird an einem Ende von einer Feder 28 vorgespannt und am gegenüberliegenden Ende von einem Elektromagneten 30 betätigt, der von einer Spannungsquelle mit unterschiedlicher Spannung beaufschlagt werden kann (nicht gezeigt), was durch den Pfeil 32 angedeutet ist.The slide of the 2/2-way valve, not shown, is at one end by a spring 28 biased and at the opposite end by an electromagnet 30 actuated, which can be acted upon by a voltage source with a different voltage (not shown), which is indicated by the arrow 32 is indicated.

In der Neutral- oder unbetätigten Stellung des 2/2-Wegeventils ist der Durchgang gesperrt, und ein Rückschlagventil 34 übernimmt die Lasthaltung.In the neutral or unconfirmed position of the 2/2-way valve, the passage is blocked, and a check valve 34 takes over the load attitude.

Der Durchgang des 2/2-Wegeventils in betätigter Stellung wird von einer Drossel 36 und einem zur Drossel 36 parallel geschalteten Zweig mit einem Rückschlagventil 38 gebildet. In der erwähnten Schaltstellung ist der Ausgang 1 mit der Leitung 18 in Verbindung.The passage of the 2/2-way valve in the actuated position is from a throttle 36 and one to the throttle 36 parallel branch with a check valve 38 educated. In the mentioned switching position is the output 1 with the line 18 in connection.

Für den Hebevorgang wird das 2/2-Wegeventil 16 angesteuert und in die Schaltstellung gebracht. Die Kugel des Wechselventils 12 verschließt den Anschluß T zum Tank 14, und das Medium gelangt von der Pumpe über das Wechselventil 12 und über die Parallelschaltung der beiden Zweige im 2/2-Wegeventil und das Rückschlagventil 26 zum Hubzylinder 22.For the lifting process, the 2/2-way valve 16 activated and brought into the switching position. The ball of the shuttle valve 12 closes the connection T to the tank 14 , and the medium passes from the pump via the shuttle valve 12 and via the parallel connection of the two branches in the 2/2-way valve and the check valve 26 to the lifting cylinder 22 ,

Ist hingegen die Pumpe inaktiv, befindet sich die Kugel im Wechselventil 12 in der in der Figur gezeigten Position. Hydraulikmedium aus dem Hubzylinder 22 fließt dann über Zweiwege-Stromregler 20 und die Drossel 36 über das Wechselventil 12 zum Tank 14. Die Senkgeschwindigkeit wird dabei über den verstellbaren Querschnitt der Drossel 36 eingestellt.However, if the pump is inactive, the ball is in the shuttle valve 12 in the position shown in the figure. Hydraulic medium from the lifting cylinder 22 then flows via two-way current controller 20 and the throttle 36 over the shuttle valve 12 to the tank 14 , The lowering speed is over the adjustable cross section of the throttle 36 set.

Claims (5)

Ventilanordnung für das Heben und Senken eines Hubzylinders, insbesondere in einem Flurförderzeug, bei der eine Pumpe über ein Wechselventil in seiner ersten Stellung und ein 2/2-Wegeventil mit dem Hubzylinder und der Hubzylinder über das 2/2-Wegeventil und das Wechselventil in seiner zweiten Stellung mit einem Tank verbunden ist, wenn ein einziges Vorsteuermittel das 2/2-Wegeventil aus der Neutralstellung, in der es den Hubzylinder in der eingenommen Position halt, in eine Schaltstellung verstellt, und der Durchgang des 2/2-Wegeventils in seiner Schaltstellung eine von dem Vorsteuermittel verstellbare Drossel enthält und das Vorsteuermittel die Drossel in Abhängigkeit von einem Vorsteuersignal verstellt, dadurch gekennzeichnet, daß der Drossel (36) ein Zweig parallel geschaltet ist, der einen beim Heben des Hubzylinders öffnendes Rückschlagventil (38) enthält.Valve arrangement for raising and lowering a lifting cylinder, in particular in an industrial truck, in which a pump via a shuttle valve in its first position and a 2/2-way valve with the lifting cylinder and the lifting cylinder via the 2/2-way valve and the shuttle valve in his second position is connected to a tank, when a single pilot control means the 2/2-way valve from the neutral position in which it holds the lift cylinder in the assumed position, adjusted to a switching position, and the passage of the 2/2-way valve in its switching position includes a throttle adjustable by the pilot control means and the pilot control means adjusts the throttle in response to a pilot control signal, characterized in that the throttle ( 36 ) is a branch connected in parallel, which opens a lifting valve when lifting the lift valve ( 38 ) contains. Ventilanordnung nach Anspruch 1, dadurch gekennzeichnet, daß das Vorsteuermittel ein Elektromagnet (30) ist.Valve arrangement according to Claim 1, characterized in that the pilot control means is an electromagnet ( 30 ). Ventilanordnung nach Anspruch 2, dadurch gekennzeichnet, daß der Elektromagnet (30) die Drossel (36) in Abhängigkeit von der angelegten Steuerspannung betätigt.Valve arrangement according to claim 2, characterized in that the electromagnet ( 30 ) the throttle ( 36 ) in response to the applied control voltage. Ventilanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Ventilglied des Wechselventils (12) gegen einen der Pumpe (10) verbundenen Anschluß (P) vorgespannt ist.Valve arrangement according to one of claims 1 to 3, characterized in that the valve member of the shuttle valve ( 12 ) against one of the pumps ( 10 ) connected terminal (P) is biased. Ventilanordnung nach Anspruch 4, dadurch gekennzeichnet, daß die Vorspannung mittels Schwerkraft und/oder einer Feder erfolgt.Valve arrangement according to claim 4, characterized in that that the Bias by gravity and / or a spring takes place.
DE200410005402 2004-02-03 2004-02-03 Valve arrangement for lifting and lowering a lifting cylinder Expired - Fee Related DE102004005402B4 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE102007027567A1 (en) 2007-06-15 2008-12-18 Robert Bosch Gmbh Control arrangement with pipe rupture function
WO2025199187A1 (en) * 2024-03-21 2025-09-25 Enerpac Tool Group Corp. Hydraulic systems for raising and lowering loads

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Publication number Priority date Publication date Assignee Title
EP2786958B1 (en) * 2013-04-05 2017-06-14 Bosch Rexroth Oil Control S.p.A. Control device for the descent of a load
CN108561347B (en) * 2018-05-31 2019-12-17 武汉船用机械有限责任公司 A cylinder hydraulic control system
CN111677710B (en) * 2020-06-09 2022-06-07 中国石油天然气集团有限公司 Hydraulic oil adjusting device for gas drilling underground power system
IT202300004146A1 (en) * 2023-03-07 2024-09-07 Valvole Italia S R L DESCENT CONTROL DEVICE FOR AN OLEODYNAMIC CYLINDER, IN PARTICULAR FOR CONTROLLING THE DESCENT OF AN OPERATING ARM

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DE3148852A1 (en) * 1981-12-10 1983-06-23 Emil Dautel GmbH, 7105 Leingarten Electrohydraulic control circuit for a tailgate
DE20208577U1 (en) * 2002-06-03 2003-12-11 Hawe Hydraulik Gmbh & Co. Kg Electro-hydraulic lift control device for industrial trucks

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DE3148852A1 (en) * 1981-12-10 1983-06-23 Emil Dautel GmbH, 7105 Leingarten Electrohydraulic control circuit for a tailgate
DE20208577U1 (en) * 2002-06-03 2003-12-11 Hawe Hydraulik Gmbh & Co. Kg Electro-hydraulic lift control device for industrial trucks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027567A1 (en) 2007-06-15 2008-12-18 Robert Bosch Gmbh Control arrangement with pipe rupture function
WO2008151727A3 (en) * 2007-06-15 2009-04-23 Bosch Gmbh Robert Control arrangement with pipe burst safety function
DE102007027567B4 (en) 2007-06-15 2018-03-01 Robert Bosch Gmbh Control arrangement with pipe rupture function
WO2025199187A1 (en) * 2024-03-21 2025-09-25 Enerpac Tool Group Corp. Hydraulic systems for raising and lowering loads

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